Find the best available evidence
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Levels of evidence
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This has been adapted from Sackett, Straus and Richardson (2000)[1]
| Level of Evidence |
Type of Study |
| 1a |
Systematic reviews of randomized controlled trials (RCTs) |
| 1b |
Individual RCTs with narrow confidence interval |
| 2a |
Systematic reviews of cohort studies |
| 2b |
Individual cohort studies and low-quality RCTs |
| 3a |
Systematic reviews of case-control studies |
| 3b |
Case-controlled studies |
| 4 | Case series and poor-quality cohort and case-control studies |
| 5 | Expert opinion |
References[edit | edit source]
- ↑ Sackett DL, Straus SE, Richardson WS, et al. Evidence-Based Medicine: How to Practice and Teach EBM. 2nd ed. Edinburgh, Scotland: Churchill Livingstone Inc; 2000:173-177.
